P0592 – Cruise Control Multi-Function Input “B” Circuit Low

P0592 is an OBD-II trouble code related to your cruise control system, not the engine or transmission itself. When this code sets, it means the powertrain control module (PCM/ECU) has detected a problem in the cruise control “multi-function” switch circuit, specifically the “B” circuit. In plain terms, the computer is seeing the wrong voltage or no signal from part of the cruise control switch on the steering wheel or column. You’ll usually lose cruise control function, but the vehicle will typically still drive normally otherwise.

What Does P0592 Mean?

P0592 stands for “Cruise Control Multi-Function Input ‘B’ Circuit Low.” The “B” circuit is one of several internal signal paths inside your cruise control switch assembly. When you press ON, SET, RESUME, or CANCEL, the switch sends specific voltages back to the PCM. If the PCM sees voltage that is too low or out of range on the “B” circuit, it stores P0592 and usually disables cruise control for safety.

On most vehicles, this code points to an electrical issue: a failing steering wheel/column switch, damaged wiring in the clockspring area, or corrosion in connectors. It’s rarely a major mechanical failure, but it can be annoying if you rely on cruise control for highway driving.

Quick Reference

  • Code: P0592
  • Definition: Cruise Control Multi-Function Input “B” Circuit Low
  • System: Cruise control / body electronics
  • Severity: Low – comfort/convenience issue, not usually a drivability risk
  • Common Fix: Replace cruise switch or repair wiring/clockspring

Real-World Example / Field Notes

In the shop, P0592 often walks in as “My cruise control just stopped working.” A typical case: a mid-2000s sedan comes in with the cruise light refusing to come on. No other warning lights, car drives fine. Scan tool shows P0592 stored. Testing reveals the ON/OFF and SET functions share the “B” circuit, and the voltage never changes when the button is pressed. After pulling the steering wheel trim, you find a cracked solder joint inside the switch or a broken wire in the clockspring. Replace the faulty part, clear the code, and the cruise control comes right back.

Symptoms of P0592

  • Cruise control inoperative – Cruise will not turn on or will not set speed.
  • Intermittent cruise operation – Works sometimes, drops out randomly, especially while turning the wheel.
  • No cruise indicator light – The dash “CRUISE” or “SET” light never illuminates when you try to engage.
  • Stored check engine code – P0592 may be stored without an illuminated MIL, depending on the vehicle.
  • Unresponsive steering wheel buttons – Specific buttons (ON, SET, RES, CANCEL) may stop working.
  • Other steering wheel control issues – In some cases, radio or phone buttons act up if the clockspring is failing.
  • Occasional ABS/traction lights – Rare, but wiring damage in the column can affect other circuits.

Common Causes of P0592

Most Common Causes

  • Faulty cruise control switch – Internal wear, broken contacts, or failed resistors in the steering wheel/column switch are the top cause.
  • Damaged clockspring (spiral cable) – The rotating ribbon cable behind the steering wheel can crack or break, causing low or no voltage on the “B” circuit.
  • Loose or corroded connectors – Moisture, spilled drinks, or age can corrode connectors at the steering wheel, column, or under the dash.
  • Broken wiring in the steering column – Wires can get pinched, chafed, or broken from repeated steering movement.
  • Previous steering wheel or airbag work – Incorrect reassembly or pinched wires after airbag, horn, or wheel replacement.

Less Common Causes

  • Faulty brake pedal or clutch switch – A stuck or misadjusted switch can confuse the PCM and interfere with cruise logic.
  • PCM/ECU internal fault – Rare, but a failed input driver inside the PCM can misread the switch voltage.
  • Aftermarket accessories – Poorly installed remote starters, alarms, or steering wheel controls can tap into the wrong wires.
  • Water intrusion – Leaks into the cabin or steering column can corrode wiring and connectors.
  • Low system voltage issues – Weak battery or charging problems can sometimes trigger odd electrical codes, including cruise-related ones.

Diagnosis: Step-by-Step Guide

You’ll want a basic scan tool (preferably one that can read live data), a digital multimeter, and basic hand tools. A wiring diagram for your specific vehicle is very helpful. If you’re working around the steering wheel or airbag, disconnect the battery and follow all safety procedures.

  1. Confirm the code – Connect a scan tool, verify P0592 is present, and check for other related codes (especially other P059x codes). Clear the code and see if it returns immediately.
  2. Check cruise operation – With the vehicle safely parked, turn ignition ON and try all cruise buttons: ON, OFF, SET, RESUME, CANCEL. Note which functions do not respond or do not light the cruise indicator.
  3. Inspect fuses and basics – Check the owner’s manual for cruise-related fuses. Verify brake lights work properly; a stuck brake switch can keep cruise from engaging.
  4. Visual inspection of steering wheel area – Look for damaged trim, aftermarket wiring, or signs someone has recently worked on the steering wheel, airbag, or radio controls.
  5. Test cruise switch resistance/voltage – Using the wiring diagram, back-probe the cruise switch “B” circuit at the connector. Press each button and verify the voltage or resistance values change to the specified ranges. If values are wrong or stuck low, suspect the switch or clockspring.
  6. Check clockspring continuity – With the battery disconnected and airbag removed (follow service manual procedures), unplug the clockspring and measure continuity on the cruise “B” circuit through the clockspring. Infinite resistance or very high resistance indicates a bad clockspring.
  7. Inspect connectors for corrosion – Unplug the steering wheel/column connectors and look for green corrosion, bent pins, or loose terminals. Clean and repair as needed.
  8. Check wiring from column to PCM – If the switch and clockspring test good, trace the “B” circuit wiring down the column and under the dash. Look for chafed insulation, rubbed-through spots, or poor splices from aftermarket installs.
  9. Use scan tool data (if available) – Some vehicles show cruise switch status (ON/OFF, SET, RES) in live data or Mode $06. Compare button presses to what the PCM reports. If the switch works but the PCM never sees it, suspect wiring or PCM input.
  10. Evaluate PCM only last – If all wiring, connectors, and components check out, a PCM fault is possible but uncommon. Have a professional verify before replacing it.

Pro tip: If other steering wheel functions (horn, radio controls, airbag light) are acting up along with P0592, the clockspring is a prime suspect and worth testing early in the process.

Possible Fixes & Repair Costs

Most P0592 repairs involve replacing a failed switch or repairing wiring. Typical repair costs vary with vehicle design and labor rates:

  • Replace cruise control switch: $100–$300 parts and labor, depending on whether it’s a simple stalk or integrated steering wheel switch.
  • Replace clockspring: $200–$500 installed, higher on some vehicles with integrated steering wheel electronics.
  • Repair wiring/connectors: $100–$250, depending on how deep in the column or dash the damage is.
  • Brake/clutch switch replacement: $75–$200, usually a quick job.
  • PCM replacement/programming (rare): $500–$1,200+ including programming.

Costs depend on your vehicle make, parts availability (OEM vs aftermarket), and local labor rates. Luxury and late-model vehicles with complex steering wheel electronics tend to be more expensive to repair.

Can I Still Drive With P0592?

Yes, you can usually keep driving with P0592 without risking immediate engine or transmission damage. The main effect is that cruise control may not work or may be unreliable. Braking, steering, and basic drivability are typically unaffected. However, if other warning lights are on (airbag, ABS, traction) or if steering wheel controls behave erratically, you should have it checked sooner. A failing clockspring can eventually affect the airbag circuit, which is a safety concern.

What Happens If You Ignore P0592?

If you ignore P0592, you’ll mostly live without cruise control. Over time, though, the underlying issue—especially a failing clockspring or damaged wiring—can worsen and begin to affect other systems like the horn, radio controls, or even the driver airbag circuit. Addressing it early can prevent more expensive and safety-related repairs later.

Need wiring diagrams and factory-style repair steps?

Powertrain faults often require exact wiring diagrams, connector pinouts, and guided test steps. A repair manual can help you confirm the cause before replacing parts.

Factory repair manual access for P0592

Check repair manual access

Compare nearby cruise multi-function trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P0580 – Cruise Control Multi-Function Input “A” Circuit Low
  • P0576 – Cruise Control Input Circuit Low
  • P0595 – Cruise Control Servo Control Circuit Low
  • P0587 – Cruise Control Vent Control Circuit Low
  • P0583 – Cruise Control Vacuum Control Circuit Low
  • P0564 – Cruise Control Multi-Function Input “A” Circuit

Key Takeaways

  • P0592 means the PCM sees a low voltage problem in the cruise control multi-function “B” circuit.
  • The most common culprits are a bad cruise switch or a failing clockspring in the steering wheel.
  • Symptoms are usually limited to inoperative or intermittent cruise control, not major drivability issues.
  • Diagnosis involves checking switch operation, clockspring continuity, and wiring from the wheel to the PCM.
  • Repairs typically range from about $100 to $500 for most common causes, depending on your vehicle.
  • You can usually drive with P0592, but ignoring wiring or clockspring issues can lead to bigger problems later.

Vehicles Commonly Affected by P0592

P0592 can appear on many OBD-II vehicles, but it’s more common on models where cruise control functions are integrated into the steering wheel. You’ll often see it on:

  • Ford and Lincoln – F-150, Escape, Fusion, Explorer, and similar models with steering wheel cruise buttons.
  • GM (Chevrolet, GMC, Buick, Cadillac) – Silverado/Sierra, Malibu, Equinox, Impala, and SUVs with multi-function steering wheels.
  • Chrysler, Dodge, Jeep, Ram – Minivans, Ram trucks, and Jeep SUVs with column or wheel-mounted cruise switches.
  • Hyundai and Kia – Sedans and crossovers with integrated steering wheel controls.
  • Volkswagen and Audi – Models using stalk or wheel-mounted cruise switches and complex clocksprings.

Any vehicle with a multi-function steering wheel and clockspring can potentially set P0592 when the switch or wiring starts to fail.

FAQ

Can I clear P0592 myself and keep driving?

You can clear P0592 with a basic OBD-II scanner, and the code may stay off for a while if the fault is intermittent. However, if the underlying issue is still present, the code will usually return and the cruise control will remain unreliable. Clearing the code doesn’t fix the root cause.

Is P0592 related to the throttle body or engine speed control?

No, P0592 is not directly related to the throttle body or engine speed control. It deals with the electrical input from the cruise control switch to the PCM. The PCM uses that signal to decide when to command the throttle, but P0592 itself points to the switch circuit, not the throttle actuator.

Can a bad brake light switch cause P0592?

A bad brake light switch is not the primary cause of P0592, but it can interfere with cruise control operation and sometimes appear alongside cruise-related codes. If your brake lights are acting strange or staying on, it’s worth checking the brake switch while diagnosing cruise issues.

How do I know if the clockspring is the problem?

Common signs of a bad clockspring include multiple steering wheel functions failing at once: horn not working, airbag warning light on, radio controls dead, and cruise control issues. Testing continuity through the clockspring on the affected circuit is the best way to confirm it.

Can P0592 cause my airbag light to come on?

P0592 itself doesn’t trigger the airbag light, but both the airbag and cruise control circuits pass through the clockspring. If the clockspring is failing, you may see P0592 along with an airbag warning. In that case, treat it as a safety issue and have it inspected promptly.